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y = 4, x = 6
let x = first number, y = second. x+y = 155 x-y = 11 add the two equations 2x= 166 x = 83 y = 72
110
x-y = 120 x+y = 150 add equations: 2x = 270 x = 135 y = 15
By solving the simultaneous equations the values of x and y should be equal to the given coordinate